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Journal of Failure Analysis and Prevention

, Volume 13, Issue 1, pp 55–62 | Cite as

Investigation of the Observed Localized Corrosion in an Industrial Steel Cation Exchanger Vessel

  • Muhammad Shirjeel Khan
  • Muhammad Ammar Anjum
  • Aqeel Ahmad Taimoor
  • Fida Mohammad
Technical Article---Peer-Reviewed

Abstract

Cation exchanger (steel vessel), containing polymeric beads as exchange resin, in a process industry is found to be affected from localized “pitting” corrosion during the turnaround. There are two main cycles of such exchanger’s operation, i.e., normal and regeneration cycles, differentiated by passing canal/well water and sulfuric acid solution, respectively. Corrosion rates by Tafel techniques are measured for both these cycles. The different corrosion rates for canal and well water are explained as per reduction reaction equilibrium. During regeneration cycle, certain other tests like cyclic polarization and potentiostatic polarization are also conducted to understand the cause of the localized corrosion. Potentiostatic tests' observations revealed an interesting phenomenon probably explaining the failure not elucidated by the conventional corrosion measurement techniques.

Keywords

Carbon steel Sulphuric acid Cathodic anodic polarization Potentiostatic measurements Acid corrosion Pitting corrosion 

Notes

Acknowledgments

The authors gratefully acknowledge the cooperation provided by Mr. Zaheer Anwar at Fauji Fertilizer Corporation Pakistan, and his taking the initiative in industrial academia collaboration.

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Muhammad Shirjeel Khan
    • 1
  • Muhammad Ammar Anjum
    • 1
  • Aqeel Ahmad Taimoor
    • 1
  • Fida Mohammad
    • 1
  1. 1.Ghulam Ishaq Khan Institute of Engineering Science & TechnologySwabiPakistan

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